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  1. S

    UK Rcd tripping

    Hi I was called to a job where the rcd was tripping after a power cut. I have tested the circuits connected to it and all ok. I have tried turning the consumer unit off and on but rcd stays on. Would a power surge when power is re-energize cause this. Any suggestions would be helpful. Thanks Steve
  2. S

    UK Advice needed! Ive been to see a job for garage power, the previous electrician has taken a 4mm on a 32amp B MCB protected by a 30mA RCD. But hasnt do

    Advice needed! Ive been to see a job for garage power, the previous electrician has taken a 4mm on a 32amp B MCB protected by a 30mA RCD. But hasnt done anything with, apart from the fact there is no protection and its T&E all straight forward. My ownly question is do i gland straight into a...
  3. S

    Diagnosing tripping RCD from septic tank pump

    Hi all, Quick question I have a bio tank pump that had been working fine up until today, it tripped the main rcd out. If i isolate the bio tank as it has its own radial I can reset the RCD. I disconnected the pump and still the same I disconnected the industrial connector and had the bare wires...
  4. J

    Flooring Tripping RCD

    I have fitted underfloor heating, using a WarmUp Wifi thermostat. When i turn it on, the RCD trips after 5 seconds on initial turn on. I have measured the following; Live - Neutral - 39 Ohm (expected for size of mats) Neutral - GND - >1M Live - GND - ~150k Now the L-G resistance of 150k seems...
  5. Z

    UK Kitchen socket trip switch keeps triggering RCD even when nothing is plugged in.

    Hello & Merry Christmas, Last week when waking up the lights and sockets in the bedrooms upstairs were off, along with the ground floor kitchen sockets. Flipping the RCD, and the trip switch for the kichen sockets and upstairs lights seemed to work fine - we have no new appliance installed or...
  6. F

    What kind of Electric Shower install is possible with my existing consumer unit?

    Hi I am moving into a ground floor flat and would like to have a new electric shower installed above an existing bath tub, unfortunately due to low pressure from the hot water tank a plumber has advised a mixer shower is not an option and neither is a pump. I am rather new to all this sort of...
  7. B

    RCD with variable ms an mA settings

    Hi, been looking at variable RCDs as came across one at a job, settings range from 30mA to 3 Amps and ms from no delay to 3 second delay can someone explain please? As if I come to test my tester only goes up to 1000mA also some I’ve seen are set on like 0.5 seconds which isn’t an RCD meant to...
  8. 4

    Split Consumer Board - R side RCD switching off L side cicuits

    Hi folks, Would appreciate some thoughts. Called to a friend's house earlier in week. No cooker or sockets. She said that the cooker had tripped a couple of times when she tried to set up the electronic timer either before or during use. Timer needs to be live to allow electric oven to...
  9. S

    RCD types and DC current

    So, this article...
  10. P

    Advice on RCD tripping

    I was called to a job with a light circuit fault tripping the RCD. There are numerous 12 volt downlights on the circuit so I did lives to CPC and got 0.3 Megs on an IR test. I switched off all MCBs controlled by the second RCD and there was no tripping from the faulty light circuit, but once...
  11. C

    MAX Zs with 61009

    Why do we have maxuim Zs for 61009 RCBO's? I didn't think Zs values really mattered if the circuit was covered by and 30mA RCBO/RCD?
  12. B

    Rcd trip times help

    Hi have 60947-2 Main Switch with added 61008 with settings for mA and mS, now come to test and it’s set on 300mA with delay of 0.5 so 500ms, now what I’m wanting to know is: 500ms is the maximum tripping time for a S type RCD, so what’s the point in having more settings as this has a variable...
  13. B

    RCD trip times

    Hi have 60947-2 Main Switch with added 61008 with settings for mA and mS, now come to test and it’s set on 300mA with delay of 0.5 so 500ms, now what I’m wanting to know is: 500ms is the maximum tripping time for a S type RCD, so what’s the point in having more settings as this has a variable...
  14. G

    UK RCD tripping out on plug circuit

    been living in this house for 8years after it was fully re-wired, today the kitchen plugs trip the RCD when any power is drawn (apart from the cooker CLOCK), all the appliances are fine, any socket that I use trips the RCD, any ideas
  15. T

    Main RCD Tripping & Not MCB

    DIY expert tried changing his own Consumer unit from an old 3036 re-wireable CU to a 18th Edition (100A main switch / 63A 30mA RCD / 7x MCBs) I was called out because he couldn't get his sockets (ring main) back on - NEITHER CAN I, I HAVE TRIED EVERYTHING I THINK... The Lines are terminated...
  16. S

    UK Adding RCD spur doesn't set but consumer RCD is fine

    Hi all, I have ran added a fused RCD spur off a socket to feed some electric gates. I figured as it was going outside I would put an RCD on the spur on it as I had one kicking around I believe it's probably unnecessary but when I connect it to the supply it will never set and constantly trips...
  17. N

    RCD spur additional protection

    Afternoon all, Quick fire question. Can a RCD fused spur still be used for additional protection under the 18th. I haven’t got my BBB with me and I recall it giving BSEN numbers for devices used for additional protection and RCD spurs not being one. Job with extra lights and changing board...
  18. C

    RCD trip time

    What are the required RCD trip time requirements? And what do you typically see in the real world?
  19. P

    Added additional LED down/up lighter and now RCD trips after about hour?

    I am a DIY house renovator. I have 5 outside lights connected to a switch in the hall. Power from the switch goes up the 2 core + earth to the first light, then all of the other 4 lights are daisy chained to each other. (Have 2 cables coming out of each light except the last one) all worked fine...
  20. S

    I know your not suppose to but in a split rcd DB can you change one of the rcd breakers for a normal breaker?

    I know your not suppose to but in a split rcd DB can you change one of the rcd breakers for a normal breaker?
  21. C

    Parallel RCD Testing

    I've got to test a bunch of temporary electrical distribution boxes (see photo example) for an events company I work with. I've done this many times before and have no issue with the actual testing. However, normally I would do it on the bench with a non-RCD'd supply so as I can test and record...
  22. M

    No power to CU or meter after resetting RCD

    I was working on a lighting circuit connected to a 3 phase board. The board has a single RCD effectively acting as the main switch. After tripping the RCD by cutting a wire (the old circuit isolated via MCB but Neutral still connected reason), I found that the power to the board didn't come back...
  23. S

    RCD tripping for bathroom heater

    I've installed an outdoor 2200W IR heater (also rated for bathrooms) in my bathroom which is connected to an outdoor IP66 rated switch and a non-latching RCD plug at the end of a 10m (2.5mm sq) artic flex outdoor cable. The last 2 times i measured, the heater worked for 17 and then 8 minutes...
  24. M

    Outside Lights trip RCD

    Hi All, I was wondering if anyone could help me with a recent problem I’ve had on a job. About 5 months ago I installed about 5 outdoor soffit lights from switch inside. All worked perfectly and customer was happy. I’ve recently been called back to the job as the outdoor lights have been...
  25. D

    Certsure testing type a rcd

    fluke 1653b tester. carrying earth loop test on type a rcd tripping
  26. KeenPensioner

    No RCD in sub main

    Hi, as I've said I'm not an electrician but studying C&G in my own time and have worked as a mate. I've just had a qualified sparky upgrade my CU to a split board 10 way dual RCD. He has run a 4mm2 cable (from a 40A MCB protected by one of the RCDs) to my hut and will be coming back to wire up...
  27. P

    RCD tripping when E7 switches on

    Firstly i'll point out that i'm the property owner and the installer of the majority of the electrical fittings in the building, including Main & E7 DB's. now the history lesson... sorry, but it is relevant property is 230 years old, I have owned it for 42 years. it was semi derelict at...
  28. B

    16th ed. Tt install...only 1 RCD

    Been to a job today, rewire Immersion cct to suit new cylinder pos. Did Zs got 12 ohm....looked a little closer... Immersion fed from b16 breaker from main switch sub board. Sub board fed via 16mm T&E submain from MCB on non RCD side of DB1. DB1 supplied direct from cutout, typical 16th split...
  29. K

    UK RCD keep tripping.

    Hi All.. I have a 16mm 3 core swa feed a 9way split board in shed, 30m from incomer .. from the split board I have run a 10mm 3 core swa to 2 way board for hot tub. This has a 63amp rcd in it.. the other end at the split board is also a 63amp rcd on its own of one side of the split board.. this...
  30. westward10

    Rcd sockets.

    Just come across this in Connections magazine.
  31. westward10

    Rcd notices.

    Had these a few months now and have just noticed.
  32. G

    RCD protection

    hi all conducting eicrs in amusement arcades usually nothing is RCD protected. sockets no RCD protection in general is c3 but when would this become c2 in this instance as it is an existing installation decades old
  33. M

    rcd requirement

    Hello just wanted to ask, my friend has done an extention, and new wiring, with new lighting, ring main, my friend has all rcbos in CU, and he has run the wiring, and contected to rcbos, but he has been told that the new wiring, i.e that the extention wiring should be rcd protercted, it dosent...
  34. B

    UK RCD vs MCB trip

    Evening everybody, I’m wondering if someone wouldn’t mind answering a question for me about RCDs. I had a water pipe burst behind my washing machine this evening, and once I’d isolated the leak I noticed the sockets had tripped. When I went to reset the breaker, I noticed that it was the RCD...
  35. A

    Zs values when there is additional RCD protection

    Hi everyone, Consider we have an RCD+MCB protection for a circuit. if we follow the tables for Zs values of a 10A, MCB, type C, the maximum value shall be 1.75 Ohm, this happens when 100A current flows ( as per MCB breaking curve). When the RCD disconnects the circuit in much less current, why...
  36. T

    UK Fridge tripping RCD via one socket but not another

    Hi, We have a ten year old fridge-freezer plugged into an older socket (20 yrs plus I should think). It started tripping the RCD on the consumer unit. I assumed I needed a new fridge and, to avoid repeatedly rebooting all equipment on the circuit while I sourced one, I plugged it in via a...
  37. T

    Plumber's reason for RCD tripping.

    Plumber changes boiler and RCD main switch starts tripping at various times when its firing up or soon after. (I was there doing other work). I test ring (that its connected to) and get +299Mohms on all tests. RCD doesn't trip at x0.5 and trips at x1 and x5, all fine. I've suggested to them...
  38. R

    Testing Loop Impedance through RCD.

    Hi, installed some circuits in a factory. The circuits were tapped off of a busbar that goes straight to the main switchgear. From this I installed a Chint RCD, which then goes to 2x Chint TP MCB and 1x Chint SP RCD. One of the TP MCB´s goes to red commando sockets and the SP MCB goes to blue...
  39. B

    Garage RCD conundrum.

    Can anyone help with this one I've been scratching my head over for a week? Called to a customer whose garage RCD keeps tripping. TNCS supply, three core SWA submain to RCD garage unit, two radial circuits (6A lights, 16A sockets). IR test from main board on whole garage installation 0.01 mega...
  40. T

    UK Bathroom lights not up rated or rcd protected

    Hi everyone just wondering what action everyone would take with this situation. I came to a house to look at a downlight that wasn't working above a bath it was not up rated and the circuit had no rcd protection being on an old wylex board with plug in mcb's. I told them that the fittings were...
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